Dividers



Aug. 14, 1956 l. BENKOE DIVIDERS Filed Dec. 30, 1952 \von 1 VEN nitedtotes Patent DIVIDERS Ivan Benkoe, London, England Applicatiou December30, 1952, Serial N0. 328,753

Claims priority, application Great Britain January 4, 1952 2 Claims.(C1. 33=-149) This invention relates to dividers and has for its chiefobject to provide a tool which will enable the center dot to be punchedWith a much higher degree of accuracy than has been possible with thehand-manipulated center punch, without the use of -complicated andexpensive apparatus.

According to the present invention the center punch is combined with adivider, the center punch forming one point of the divider and being somounted on the divider than the center punch may be pre-set so that itwill lie perpendicular to the surface to be marked when the divider isadjusted to the desired dimension.

Preferably the center punch is carried by a graduated segment pivotallymounted on one leg of the divider, said segrnent co-operating with anindex mark on the divider leg to enable the center punch to be adjustedso that it will be perpendicular to the surface to be marked.

The center having been located With the aid of the combined divider andcenter punch, the center dot is made by a light tap on the end of thecenter punch.

In Order that this invention may be the more clearly understood andreadily canied into efiect, reference may be made to the accompanyingdrawing which is a front elevation of the preferred form of combineddivider and center punch according to the present invention.

Referring now to the accompanying drawing, in the divider thereinillustrated one leg is provided With the usual point 11. The other leg12 is provided With a center punch 13 which is carried by a segrnent 14pivotally mounted as at 15 on the end of the leg 12. punch 13 is sodisposed that its upper end is exposed clear of the segment and leg sothat said end may be impacted. The segment 14 is slotted as at 16 and isadapted to be locked to the leg 12 in its adjusted position by means ofa nut 17 on a screw 18 carried by the leg 12 and passing through theslot 16. The upper edge of the segment 14 is graduated as at 19 andco-operates wi-th an index mark 20 on the leg 12.

The graduations 19 a1e spaced and numbered in such a manner that whenthe segn1entis set to correspond With the dimension to which the divideris to be adjusted the center punch 13 will become located perpendicularto the surface 10 be marked. Thus, if the adjustment of the divider isto be of the order of 4 inches, the segment is pre-set to 4. Sirnilarly,if the adjustment of the divider is to be of the order of 2 /2 inches,the segment is pre-set to the graduation between the marks 2 and 3.

In use the divider is used in the normal way to mark out the center andwhen the center has been located the end of the center punch is given alight tap to displace it longitudinally and indent the Center dot.

Due to the fact that the center punch will lie perpendicular to thesurface as a result of its pre-setting whatever be the adjustment of thedivider any error that might arise if an independent center punch wereused will be avoided.

It must be clearly understood that whilst the graduated pivoted segment14 and the index mark 20 form a very simple and el1ective means ofsetting the center punch relative to the leg of the divider any othermeans of obtaining this setting may be employed without departing fromthe scope of the present invention.

The dividers according to the present invention are preferably used inconjunction with the setting gauge described in my co-pending patentapplication N0. 294,338, now Patent 2659977 as such a gauge enables thedividers to be easily set to a high degree of accuracy.

What I claim is:

l. A combined divider and center punch comprising a graduated segmenthaving an arcuate slot pivotally mounted on one leg of the divider, acenter punch carried by said segment for longitudinal displacement, theupper end of said punch being exposed clear of the segment and the legso that it can be impacted for longitudinal displacement relative tosaid segment, a screw outstanding from said leg passing through saidarcuate slot, an index mark on said leg co-operating with thegraduations on the segment and a locking nut on said screw whereby thecenter punch can be pre-set so as to lie perpendicular to the surface tobe marked when the divider is adjusttid to the desired dimension and thecenter dot made by a light tap on the end of the center punch.

2. A combined divider and center punch which com prises, in combination:a pair of divider legs, said legs being pivotally moun-ted, one withrespect to the other, at a. pivot point so that they may be arcuatelyswung with respect to each other about said pivot point; a graduatedsegment having an arcuate slot, said segment being pivotally mounted onone of said divider legs so that it may be swung arcuately with respectto said leg through an arc of considerably shorter radius than that ofthe arc through which said pivotally mounted divider legs may be swung;a center punch carried by said graduated segment so that it is swungarcuately through said arc of shorter radius when said graduated segmentis swung With reference to said divider leg on which it is mounted, saidpunch being longitudinally displaceable relative t0 said segment andbeing so disposed thereon that its upper end is exposed clear of thesegment and the leg, whereby, the upper end of said punch can beimpacted to thereby displace said punch longitudinally relative to saidsegment; a screw outstanding from said leg and passing through saidarcuate slot in said graduated segment; an index mark on said legcooperating With the graduations on said graduated segment; and alocking nut on said screw, whereby said center punch can be pre-set soas t0 lie perpendicular to the surface to be marked when the combineddivider and center punch is adjusted to desired dimensions, the centerdot being then made by a light tap on the end of said center punch.

References Cited in the file of this patent UNITED STATES PATENTS225,436 Sullivan Mar. 9, 1880 966,015 Hausen Aug. 2, 1910 1,009256OLeary Nov. 21, 1911 1410,189 Johnson Mar. 21, 1922 FOREIGN PATENTS440,285 France Ap1'. 30, 1912

